Sir Elton John announced yester day that someone had “stolen his heart.” He was talking not about longtime partner David Furnish but a 14-month-old Ukrainian orphan, whose parents died after struggling with AIDS. John performed for HIV-positive children at an orphanage near Donetsk, Ukraine, over the weekend, and he and Furnish toured the orphanage as part of John’s AIDS foundation work. The couple is seeking to adopt the child, Lev, and readying for what stands to be a complicated process, because UK adoption rules have stipulations concerning the parents’ ages and John never thought he’d be a parent at 62.